Lifting-jack



O. E. FLOHR.

LIFTING JACK. APPLICATION HLED MAY 24, 1919.

1,349,195. Patented Aug. 10,1920.

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UNITED STATES PATENT OFFICE.

OTTO E. FLOHR, OF TOLNA, NORTH DAKOTA.

LIFTING-JAGK.

Specification of Letters Patent. Patented A11 10, 1920,

Application filed. May 24, 1919. Serial No. 299,542.

The object of the invention is to provide a simple, strong jack of thischaracter equipped with simple and efficient means for holding the leverafter the lifting operation its been effected.

.Lnother object of the invention is to proide a lifting jack in whichthe locking of tl'le parts after adjustment will be entirely automatic.

With the foregoing and other objects in view. which will appear as thedescription proceeds. the invention resides in the coiniination andarrangement of parts and in the details of construction hereinafter desribed and claimed. it being understood that (-hanges in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed without departing from the spirit of theinvention.

n the accompanying drawings:-

Fiqure 1 representsa side elevation of a lifting jack constructed inaccordance with invention with the object supporting member shown-raisedin-full lines and low ered in dotted lines.

Fig. 2 is a transverse section taken on the line 22 of Fig. 1. and

iii. 3 is a detail sectional View through the supporting arm. thelifting bar on which it is mounted being shown broken off for onveniencein illustration.

In the embodiment illustrated. the jack constituting this inventioncomprises a suitable base 1 from which rises a standard 2 dried to thebase in any suitable manner. The upper end of this standard 2 isbifurcated and is shown reinforced by a metal strap 3.

A lever 4: is fulcrumed in one end between the furcations of thestandard 2 as shown at 5 and this lever has an elbow 6 positioned at therear of its fulcrum. the handle l thereof being much longer than the end4: on the other side of its fulcrum.

A lifting bar 7 is pivoted at its upper end to the free end of the arm 4of lever 1. This lilting bar 7 is guided at its lower end in an aperture10 formed in the brace 9 which connects the standard 2 with the base 1.It will thus be seen that this member 9 performs the double function ofa brace and a guide.

supporting arm 11 is adjustable vertixlly upon the lifting bar 7 and hasa collar 22 encircling said bar, the inner diameter of the collar beingslightly greater than the diameter of the bar 7 as is shown clearly in iig. 3, so that when the weight l/V. rests on and is supported by the arm11, the diagonally opposite edges of the collar will bite into the barand securely lock the arm in adjusted position.

A lever locking member is shown in the form of a spring metal bar 13bolted at one v ii to the standard 2 intermediately of its mils andpositioned obliquely in relation to the. standard, the free end of saidbar 13 being hook-shaped as shown at M and which is designed to engagelever *1 after it has been lowered for effecting the lifting operationas shown in Figs. 1 and and thereby reliably retain it in this position.

To the use of this invention, the supportarm ll is adjusted beneath theaxle of a icle or other object to be raised and the t) or it is thenthrown down, causing the flarin bar 7 to be elevated and the strainexerted by the weight of the object lifted on the arm 11, will cause thecollar to bite at its diagonally opposite front and rear edges into thebar as shown in Fig. 3 and consequently will be held secured to the barit 3 will be moved upward, therewith on the lowering of the lever.

After the supporting arm 11 has been moved to the desired extent, thehook 14 of bar 13 is engaged with the lever as shown in Figs. 1 and 2,and the parts thus held in this position. with the lifting arm 11 andthe object mounted thereon in elevated poiii-on shown in full lines inFig.1.

From the foregoing description, taken in connection with theaccompanying drawings, the advantages of the construction and of themethod of operation will be readily apparent to those skilled in the artto which the invention appertains and while I have escribed theprinciple of operation of the invention together with the device which Inow consider to be the best embodiment thereof, I desire to have itunderstood that the device shown is merely illustrative and that suchchanges may be made as are within the scope of the claimed invention.

iiaving thus fully described my invention, what I claim as new anddesire to secure by Letters Patent, is i A lifting jack comprising asupporting base, a standard rising therefrom with its upper endbifurcated and having a metal strap extending over and connecting thefurnations thereof, a substantially elbow-shaped lei er fulcruinedintermediately of its ends adjacent the bend thereof between saidureations under said strap, one end oi said loser being longer than theother, a lifting bar pivoted at its upper end to the terminal of theshort end of said lever, and an upwardly and outwardly inclined springmetal bar fixed at one end to said standard and projecting on the sidethereof opposite to that carrying the lifting bar, said metal bar havinga hook at its free end for engaging the long end of said lever when inlowered position.

In testimony whereof I affix my signature in presence of two Witnesses.

OTTO E. FLOHR. Witnesses A. J. JOHNSON, R. E. EUGEN.

